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In Operation Measurement and
Calibration
Testing the pH probe
If the probe meet following qualifi cations, it can be used in the system and it is
functional:
Probe has no visible mechanical damage.
Measured pH value is in tol/- 1,0 (example - water pH is 7,2 and probe
is measuring 7,9 - the tolerance is 0,7 so lower than 1,0 - the probe is OK)
Probe response to positive or negative changes in water or buff er. (example - if
you dive the probe with dry and clean tip to 7,0 pH buff er the 1 minute response
must be at least 90%)
If the probe meet all above qualifi cations and the ASIN AQUA Oxygen does
not allow calibration it is necessary to upgrade the software to version with
calibration range 7,0 +/- 1,0.